Abstract
Controlled induction electric drive systems operating in cyclic modes, for example, on metallurgical mechanisms for transporting processed metal, must ensure acceleration stabilization at the required level, both at maximum and partial loading of the transport mechanism. Frequency induction electric drive systems with an autonomous current inverter (ACI) can be made with an unregulated rectifier and an additional transistor switch in the DC link, while the function of regulating the inverter input current is assigned to the transistor switch. In this case, due to the use of a diode rectifier, the reactive power consumption from the network is reduced compared to a standard ACI system containing an adjustable rectifier. The control of the transistor switch can be performed on the basis of various principles, for example, by constructing a closed acceleration stabilization circuit, which makes it possible to adaptively adjust the starting torque and maintain constant acceleration of the induction electric drive. The acceleration signal can be identified based on the conversion of the signal coming from the digital speed sensor encoder. An additional transistor switch with a series-connected choke can also be included in the DC link of an IF based on an autonomous voltage inverter (AVI). This makes it possible, at the initial stage of starting an induction electric drive and when operating on adjusting mechanical characteristics, when lower values of the frequency and amplitude of the voltage supplying the motor are required, due to the operation of the transistor switch, to reduce the voltage at the inverter input, which leads to a decrease in the number of the inverter key elements switching. Despite the available publications, the operation of a frequency converter with a voltage inverter and an additional switch in the DC link has not been studied in sufficient detail yet. The purpose of the study is to obtain and analyze experimental time characteristics, such as voltage instantaneous values at the AVI input and currents at the AVI output, using a pilot plant with an adjustable induction electric drive based on an AVI with a relay-controlled transistor switch in the DC link. As a result of the research carried out, the requirements have been clarified for the switchboard and the components implementing the electric drive control system.
Keywords
induction electric drive, vector control, relay controller, correction, transistor switch, acceleration, experimental characteristics
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